linux-kernel - Re: [PATCHv3 8/8] videobuf2: handle non-contiguous DMA allocations

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Message-ID: <YP4zHRh+jHJGbNHz@google.com>
Date:   Mon, 26 Jul 2021 12:59:25 +0900
From:   Sergey Senozhatsky <senozhatsky@...omium.org>
To:     Dafna Hirschfeld <dafna.hirschfeld@...labora.com>
Cc:     Sergey Senozhatsky <senozhatsky@...omium.org>,
        Tomasz Figa <tfiga@...omium.org>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Ricardo Ribalda <ribalda@...omium.org>,
        Christoph Hellwig <hch@....de>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        Collabora Kernel ML <kernel@...labora.com>
Subject: Re: [PATCHv3 8/8] videobuf2: handle non-contiguous DMA allocations

On (21/07/22 19:26), Dafna Hirschfeld wrote:
> Also, the 'cookie' cb returns buf->dma_addr which is not initialized for
> the noncontiguous api. So it is not clear how drivers should use the new api.
> Many drivers call vb2_dma_contig_plane_dma_addr which returns the cookie.

Hmm, that's a good find. Is ->dma_addr the same as what we have in
sgt.sgl->dma_address for non-contig?